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// 使用字符串字面量创建空字符串 var stringA = "" if stringA.isEmpty { print( "stringA 是空的" ) } else { print( "stringA 不是空的" ) } // 实例化 String 类来创建空字符串 let stringB = String() if stringB.isEmpty { print( "stringB 是空的" ) } else { print( "stringB 不是空的" ) }
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